:root{--bg:#f4f7fa;--surface:#fff;--soft:#eaf1f6;--tint:#e9f8f8;--nav:#102e46;--dark:#163c57;--aqua:#13b8c5;--blue:#237bd3;--title:#18364b;--ink:#344c60;--muted:#64798a;--border:#dce6ed;--footer:#0b2539}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.8 Arial,"PingFang SC","Microsoft YaHei",sans-serif;overflow-wrap:break-word}a{color:#146ba9;text-underline-offset:4px}a:hover{color:#095379}a:focus-visible,button:focus-visible,summary:focus-visible{outline:3px solid var(--aqua);outline-offset:3px}h1,h2,h3,h4{color:var(--title);line-height:1.35;margin:0 0 .65em}h1{font-size:clamp(2rem,3vw,2.25rem)}h2{font-size:clamp(1.45rem,2.2vw,1.75rem)}h3{font-size:1.24rem}p{margin:.2em 0 1.1em}ul,ol{padding-left:1.4em}li{margin-bottom:.35em}strong{color:var(--title)}.container{width:min(1200px,calc(100% - 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img{display:block;max-width:100%;width:auto;height:auto;max-height:var(--media-limit,220px);object-fit:contain;object-position:center}.media-frame--logo{--media-limit:38px;width:auto;border:0;padding:0}.media-frame--hero{--media-limit:310px}.media-frame--feature{--media-limit:250px}.media-frame--card{--media-limit:185px}.media-frame--wide{--media-limit:210px}.media-frame--mobile{--media-limit:350px;max-width:320px}.media-placeholder{min-height:100px;color:#64798a;font-size:13px;text-align:center}.media-placeholder.media-frame--logo{min-height:32px;min-width:100px}.media-placeholder.media-frame--hero{min-height:145px}.split{display:grid;grid-template-columns:1fr 1fr;gap:35px;align-items:center}.split--wide{grid-template-columns:1.15fr .85fr}.split--narrow{grid-template-columns:.78fr 1.22fr}.editorial-band{background:white;border-block:1px solid var(--border);padding-block:52px}.topic-index{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:0 32px}.topic{border-top:1px solid 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@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{transition:none!important;animation:none!important}}